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  <title>从 GD2 文件或 URL 新建一图像</title>

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 <div class="refnamediv">
  <h1 class="refname">imagecreatefromgd2</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.7, PHP 5)</p><p class="refpurpose"><span class="refname">imagecreatefromgd2</span> &mdash; <span class="dc-title">从 GD2 文件或 URL 新建一图像</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imagecreatefromgd2-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">resource</span> <span class="methodname"><strong>imagecreatefromgd2</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
   )</div>

  <p class="para rdfs-comment">
   从 GD2 文件或 URL 新建一图像。
  </p>
  <div class="tip"><strong class="tip">Tip</strong><p class="simpara">如已启用<a href="filesystem.configuration.html#ini.allow-url-fopen" class="link">fopen 包装器</a>，在此函数中， URL 可作为文件名。关于如何指定文件名详见 <span class="function"><a href="function.fopen.html" class="function">fopen()</a></span>。各种
wapper 的不同功能请参见 <a href="wrappers.html" class="xref">支持的协议和封装协议</a>，注意其用法及其可提供的预定义变量。</p></div>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imagecreatefromgd2-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">filename</code></em></dt>

     <dd>

      <p class="para">
       GD2 图像的路径。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imagecreatefromgd2-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">成功后返回图象资源,失败后返回 <strong><code>FALSE</code></strong> 。</p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imagecreatefromgd2-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3138">
    <p><strong>Example #1 <span class="function"><strong>imagecreatefromgd2()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;加载&nbsp;gd2&nbsp;图像<br /></span><span style="color: #0000BB">$im&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatefromgd2</span><span style="color: #007700">(</span><span style="color: #DD0000">'./test.gd2'</span><span style="color: #007700">);<br /><br /><br /></span><span style="color: #FF8000">//&nbsp;在图像上应用效果。<br />//&nbsp;在这个例子中，如果版本为&nbsp;PHP5+&nbsp;则反转图像颜色<br /></span><span style="color: #007700">if(</span><span style="color: #0000BB">function_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'imagefilter'</span><span style="color: #007700">))<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">imagefilter</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">IMG_FILTER_NEGATE</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;保存图像<br /></span><span style="color: #0000BB">imagegd2</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'./test_updated.gd2'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.imagecreatefromgd2-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。</span></p></blockquote>
  <div class="warning"><strong class="warning">Warning</strong><p class="para">Windows 版本的 PHP 在 4.3.0
版之前不支持通过此函数访问远程文件，即使已经启用 <a href="filesystem.configuration.html#ini.allow-url-fopen" class="link">allow_url_fopen</a>.
</p></div>
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